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Regge exchange contribution to deeply virtual compton scattering

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Llanes Estrada, Felipe José and Szczepaniak, Adam P. and Londergan, J. T. (2009) Regge exchange contribution to deeply virtual compton scattering. Acta Physica Polonica B, 40 (8). pp. 2193-2223. ISSN 0587-4254

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Abstract

Recently we have shown that exclusive QCD photon-induced reactions at low Mandelstam-t are best described by Regge exchanges in the entire scaling region, and not only for low values of Bjorken- x. In this paper we explore this crucial Regge behavior in Deeply Virtual Compton Scattering from the point of view of collinear factorization, with the proton tensor written in terms of Generalized Parton Distributions, and we reproduce this feature. Thus it appears that in the Bjorken limit, a large class of hard, low-t exclusive processes are more sensitive to the meson cloud of the proton than to its fundamental quark structure. These process will then be described most efficiently by process- dependent Regge Exclusive Amplitudes rather than by universal Generalized Parton Distributions. We introduce such Regge Exclusive Amplitudes for Deeply Virtual Compton Scattering.


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Additional Information:

We would like to thank S. Brodsky, P. Hoyer, JM. Laget, P. Kroll, D. Muller, A. Radyushkin and M. Strikman for useful discussions and comments. This work was supported in part by the US Department of Energy grant under contract DE FG0287ER40365, by the US National Science Foundation under grant PHY- 0555232, and by grants FPA 2004-02602, 2005-02327 (Spain). FJLE thanks also the Nuclear Theory Center at Indiana University and the Institute for Theoretical Physics at Graz University for their hospitality during the preparation of this work

Uncontrolled Keywords:Generalized Parton Distributions, Exclusive Electroproduction, Nucleon, Mesons, Model, Hera
Subjects:Sciences > Physics
ID Code:22746
Deposited On:10 Sep 2013 17:12
Last Modified:20 Apr 2018 18:17

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